A improved equine dental speculum includes upper and lower frames pivotably connected to one another, upper and lower jaw and teeth engagement bars mounted on respective ones of the upper and lower frames which fit in the horse's mouth, frame spacing bars extending between and connecting the frame and the frame spacing securement devices which each include a slide stop assembly movably mounted on the frame arm which includes a movably mounted carriage and a stop bar adjustably mounted thereon, the stop bar having a frame arm slot extending transversely therethrough and having dimensions slightly larger than the cross-sectional dimensions of the frame arm and through which the frame arm extends to releasably frictionally engage the frame arm so that the upper and lower frames will open along with the horse's mouth yet prevent the horse from closing its mouth until the stop bar is released.
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